package com.hmdp.service.impl;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result getList() {
        String key = "cache:shopType";
        //从redis查询数据
        String json = stringRedisTemplate.opsForValue().get(key);
        //有数据直接返回
        if (StrUtil.isNotBlank(json)) {
            List<ShopType> typeList = JSONUtil.toList(json, ShopType.class);
            return Result.ok(typeList);
        }


        //没有数据,查询数据库
        List<ShopType> shopTypeList = this.list();
        //判断查询数据是否为空
        if (shopTypeList == null) {
            //为空,返回信息
            return Result.ok(null);
        }
        //不为空,把数据写入redis
        String jsonStr = JSONUtil.toJsonStr(shopTypeList);
        stringRedisTemplate.opsForValue().set(key, jsonStr);
        //返回信息
        return Result.ok(shopTypeList);
    }
}
